Left or right prediction correct, main prediction wrong

I'm having a weird issue with predictions.

The prediction on the left or right in the prediction bar is correct 99% of the time.  The prediction in the middle is almost always wrong, except for the most common words (the, and, etc).  

This is relatively new, and I have no idea how my main predictions (handy for quick autoinsertion) have gone off in the weeds while it nails that secondary prediction almost every single time.  It's close, but oh so far.

Anyone else run into this?  Any suggestions other than blowing out predictions and starting from scratch?  I'm using the Android app on an S8.